Do you know what happens if everyone must agree? From wikipedia: Freedom of speech in Poland was far greater than in other European countries. Moreover, any single member of the Polish parliament during the 17th and 18th century had an absolute veto (lat. liberum veto), so that complete consensus—which could be attained only with great difficulty—was required for every issue. Originally, the procedure was used for points of order and similar technical issues, however, it was later abused.
That's right. Nothing gets done.

So in our apartment complex there were no rules beforehand that prevented someone from pooping in public areas, because there was an implicit understanding that this is not something you do. However after a difference of opinion you've just started to do this to annoy me. Everyone but you wants this to stop, but you're having too much fun annoying me. What are we as residents to do about you? You're being extra cautious to make sure you don't overstep any other boundaries to ensure that you can keep doing this for as long as you please.

Obviously the first cause of action is to talk to the parties involved. I thought we talked about what happens when people can't agree. Dealing with pleasurable people are rarely a problem.

And connecting back to the driving part. When a road is built, everyone who uses this road agrees to a specific limit, then someone else starts using the road. Do we need to assemble everyone again and agree to keep the limits as they are, or can they just stay the same?
After constructing a new road in the LA-area, which people should we invite to have a say in what speed limit there should be on it. Everyone affected by or using it? Do you think you'll be able to set a limit on this side of the heat-death of the universe?